Hot-air furnace.



No. 648,861. Patented May I, I900. A. M. ELEY.

HOT AIR FURNACE.

(Application filed. May 27, 1899.)

(No Model.)

ALFRED nnnnr, or NILES, onion HOT-AIR FURNACE.

' SPECIFIGATIOIQ' forming part of Letters Patent No; 648,861, dated may 1900.

' Application filed May 27,1899. Serialllo. 71 ,542. (Nomodeh) thoroughly burning all the-gases, to prevent the escape outside of the furnace of dust particles during the shaking of the girate, to prevent the f-uel, especially soft coal, from adhering to the fire-pot, to supply hot air to the fire-pot at numerous points, and thereby enable combustion to be obtained without too great consumption-of fuel, and, lastly, to provide a furnace which will be strong, durable, and highly efficient. Y

ll'be hereinafter fully set in the The invention wi forth, and particularly pointed out claims.-

In the accompanying drawings,.l igure 1 is View, partly in section and partly in elevation, showing a furnace embodying my inven: tion. Fig. 2 is a horizontal sectional view on line 2 2, Fig. 1. Fig. Sis a sectional view on line 3 3, Fig. 1. Fig. -1 is a sectionaldetaiL- Referring to the drawings, A designates the-furnace-casing, and a the outer inclosi'ng casing from which hot air is conveyed by flues throughout a house or building.

1 is the, aslrpit, 2 the fire-pot, and 3. the combo stion-chan1be1z The ash-pit l is formed withan annular ring l, supported by braces 5. The grate 6 rests on this ring and is provided with a central movable section 7 over the front end of which the poker-door 8 islooated, above the door 9 of the ash-pit. In the ring 4: are formed several fines or openings a, through which the dust and light particles of ashes-will pass from the ash-pit to the combustion-chamber. The fire-pot'2is composed of a cylindrical section [L2, resting on the ring.

4, the same beingconcentric with the casing A and forming, inconj unction with the latter, a hot-air chamber 15, which entirely encircles from above by the chains (1'.

the fire-pot. An upper rim or section et rests in a groove a formed in the top edge of section a and is fiaredin bell-like form, throwing its upper end close to, but not in contact with, the casing A, thus leaving communicationbetween the hot-air chamber B and the combustion-chamber 3. The section'a of the fire-pot is formed throughout with vertical corrugations h and transverse holes or ports tion. By reason of these'corrugations coal is prevented from adhering to the fire-pot, or

the danger of its doing so is reduced to a minimum, and channels are formed in which 6o 1), arranged in series around the entire secthe blaze may rise and thus keep the fire-- pot quite hot, heating the air in the chamber 12 will ignite the gases in the fuel and cause them to blaze up in the channels,

C designates cold'air-inlet fines their inner ends into the hot-air chamber 13.

These fines occupy inclined positions, their This hot air entering .through theheles' opening at inner ends being higher than the outer ends,so

that the air entering therethroi'igh'will pass upwardly into chamber B and prevent hot air passing outward through'the flues. Eachfine is provided with a valve or damper "for controlling the admission of cold air.. I have shown valves d hinged at. their upper ends to the lines and capable of being controlled When these valves are unse-ated, cold air willbe admitted into chamber B and being heated will pass through the holes or ports into the lire-pot effecting the thorough burning of the fuel gases atall points. Thus I avoid using any forced draft from beneaththe gratesection, the heated oxygen coming in contact with the gases in the fuel causing a gas-blaze allaroun'd the fire-pot.

D designates the fuel-supply door, which is composed of plates 10, 11, and 12, suitably secured together. The outer plate 10 is formed at its top with air inlet openings'e. The central plate 11 at its bottom'is formed with a continuous slot 6', whilethe plate 12 is formed at its top with air-discharge openings 6 Any and 11 and suitable slide or damper e may be arranged to 1 Tline to the outlet-flue,

through the openings 6 -is'h-eated-before' it enters the furnace and when discharged therein-will eife'ct the comthrough iheslot e and upwardly between the plates 1-11;a nd-1'2 and then into the-furnace In this 'waythe air inside of the top section f? of easing A (See 2 Fig.4.) 'In'this way the deflector-plate is se-,

,cured in position without the use of boltsa'nd screws 7 slightly bulged at g to form an -annular recess;- I

't() accommodate a coiled pipe G if it is desired to effect the heating 'of water withimthe fur-- This top section f of th'e casingis nace. The top section f? of the oasin'gjis' depressed at its cente'rin concave-convex form I and provided with} an upwardly-projectingflange g which. is formed witha series iof spaced-apart V-shaped ribs 'g.: The outfittflue section g is formed at its inner endwitli a'series of grooves 9 which correspond to the ventedfrom turning laterally. The flue may rise unburned fromzthe combustion-chamber,

' beextended in any desired direction from; the furnace by first removing it from the flange and thenreplacing it in engagementtherewith. The advantages'of my invention areappar cut to those'skilled in th'e-art; ltwill be' observed that I have produced an extremely simple and inexpensiveifurnace having means for readily increasingthe he'atingicapacity of-vthe furnaceand efiecting the-thorough coinbustion'of all-gases.- Should any gases as when the fire-pot is filled with fuel,"the air- 7 space between the flared end of the pot and the casing will admit sufficient hot air to ef-' foot the consumption of such. gasesygand should it be desirable to burn still less fuel the hotair admitted through-the fuel-door Vtion-chamber, a fire-pot located withinsaid casing-below said combustion-chambeigan airchamber having an upper contractedoutlet passage being formed between saidcasingand said fire-pot said outlet-passage leading into said combustion-chamber, and cold-airflues communicating with openingsin the outer -tion-chamber, a fire-potdocated within said casing and having its upper'edlgje flared to ap-' proach "thelower walls-of said combustion; 7o

chamber, an 'air-chamber being formed 'between said casing and said'fire-pot and com municating with said combustion-chamber around the flared edges of said fire-pot, and

"cold-air flue'sf communicating with openingsin the outer'walls'of said air-chamber; sub

stantially as set forth, a

' 3-. A furnace comprising a casing havinga flared or enlarged portion forming a combus' 'tien chamber, a cylindricalfire-pot located in said asing,;an air-chamber being formed between thesame and the walls of said casing,

lair inlet flues opening i; to said air-chamber,

substantially asset forth.

4. Affurna ce comprising-a casingha'vinga go flared or enlargedpltion forming a combus tion-chamber a cylindrical fire-pot located in said casing; an air-chamberbeing formed be-I tween thesame andthe walls of said-casing, -said,fire-pot being provided with longitudinal corrugations and transverse-perforations, an

upper-flaring rim supported by said "fire-pot and forming, with. theiwall' of z -said casing;

ya contracted airpassage between saidair section is securelylheld to the casing 'andprei and-combustion. chambers; upwardly-inclined 16o ,c'old-air fines-communicating with said airchamber, and meansior regulating the supe forth.

-= "5. A'furnace' comprisinga casing having a oombustion chainber, an annular rim secured I to said casing and'pro'vided withflues or openingsga fire-pot supportedzby said rim'formed :of" two. concentric'menibers,'one of which is "provided with holes or ports,ian air-chamber no b'eingformed'between said casingand-said fi're pot "and-communicating: at its top with said-combustiomchambengand cold-air fl'ues- 5 leading into said ant-chamber, substantially assetferthJjgg g 6. Affurnacecom prising a casing having a combustion-chamber, an annular rim located therein-havingagroove'inits top surface and provided with flues or openings, a cylindrical fire-pothaving its lower edgerestingin said [20 groove and having a corresponding groove in its'upper edge, an air-chamber being formed between said fire pot and said casing, an up- "per flaring rim or section'resting in the groove Ot said firegpot and formingf'a contracted r25 airpassage between the air and combustion chambers-and cold air'flu'es leading. into said air-chamber, substantially as, set forth.

[7. A furnace comprising aca'sing having a openings-and having an'annular groove; a

g'ratesupported by'an'annular flange of said combustion chamber, an annular rim located I 30 within saidfcasing and provided with lines or Y .bfi sti n-chamber, and cold-air 'fiues leading provided with hol es 01 ports, an air-chaimbel; specification in the presence of two subsoil-iii being formed betwee said'ca ing 4 d said ing'witnesses. 1 v fire-pot and commumcatmg with 831(100111- M. ELEY' 5 into said air-chamber, substantially as set Witnesses: I forth. I WILLIAM D. LEWIS,- In testimony whereof [have signed this FRANK R. OOWDEBY. 

